<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        /* 合并现象 */
        div {
            height: 200px;
            width: 200px;
            background-color: pink;
        }

        .one {
            margin-bottom: 200px;
        }

        .two {
            margin-top: 50px;
        }
    </style>
</head>

<body>
    <div class="one">11</div>
    <div class="two">22</div>
</body>

</html>